Depolarization occurs in the four chambers of the heart: both atria first, and then both ventricles. The sinoatrial (SA) node on the wall of the right atrium initiates depolarization in the right and …

2024年12月11日 · The answer lies in the complex process of cardiac action potential, which includes two important phases: depolarization and repolarization. These electrical events …

Contraction of the atria follows depolarization, represented by the P wave of the ECG. As the atrial muscles contract from the superior portion of the atria toward the atrioventricular septum, …

The different waves that comprise the ECG represent the sequence of depolarization and repolarization of the atria and ventricles. The ECG is recorded at a speed of 25 mm/sec (5 …

The three waves of the QRS complex represent ventricular depolarization. For the inexperienced, one of the most confusing aspects of ECG reading is the labeling of these waves. The rule is: …

2023年11月28日 · That is, a positive impulse (or wave of depolarization) traveling toward a positive electrode should produce a positive (upright; above the isoelectric baseline) …

2023年4月17日 · AV node conduction is characterized by a conduction delay, which ensures that ventricular contraction occurs after the atria empty its blood into the ventricles. From the AV …

2016年6月11日 · The P wave, which represents atrial depolarization, is the first waveform seen in any cycle. Atrial depolarization is initiated by spontaneous depolarization of pacemaker cells in …

The R wave is very positive because early ventricular depolarization is largely directed toward this lead. The S wave is also present because the terminal depolarization of the upper wall of the …

The P wave is a small low-voltage deflection away from the baseline that is caused by the depolarization of the atria prior to atrial contraction as the activation (depolarization) wave-front …